Free wheel for the platen of typewriting machines



C. KUPFER. FREE WHEEL FOR THE PLATEN 0F TYPEWRITINGMACHINES.

APPLICATION FILED AUGJ, I921. 1,438,603. Patented Dec. 12, 1922.

v 2 SHEETS-SHEET l. 7 71059 17118 3 @7 7? -73 ,z a I/ A\\\\\\W WI TNEf/E/I FOQ IN VENT 0/? I E @KWW 2 c. KUPFER. FREE WHEEL FOR THE PLATEN 0F TYPEWRITING MACHINES.

APPLICATION FILED AUG. I, I921- 1,438,603, Patented Dec. 12, 1922.

2 SHEETS-SHEET 2.

WI TNEf/Ef. FOR INVEIWUQ:

Patented lllec, l2, lQZZZ.

v ma -i F n w o CARL KUPFER, 0F NUBEMBEEG, "Y, ASSIG-lliOI-t TO THE FIEIEII TRIUlllIPH-W'ERKE NURNBEBG A.-Gr., OF NUEIEHDBEEG, BAVARIA, GERMANY. I

rnnn wrinnt FOB train rnarzsn or 'r'rrnwnrrrne ivrnontrlvns.

Application as time 1., rear. Serial No. 489,137.

To all whom it may concern:

Be it known that T, CARL Korma, a citizen of the German Republic, residing. at Nuremberg, Germany, have invented certain new and useful improvements in Free Wheels for the Platens 0t Typewriting Ma chines, of which the following is aspect fication. j 5

It is known to insert a coupling device or free wheel between the platen and line'spacing wheel of a typewriting machineso as to enable the platen to be rotated independ ently of the line spacing wheel. This invention has for its object to improve the construction of such coupling device to render the platen readily detachable. Accord ing to the invention the platen spindle is made in two parts which fit into a tubular connecting member, one of such parts be ing movable longitudinally and connected with the line spacing wheel coupling.

In order that the invention maybe clearly understood, 1 shall proceed to describe the samev with reference to the two forms oi? construction shown by way of example in the accompanying drawings, wherein Figs. 1 to 7 relate to the li st tor-m oii'construction and Figs. S to 11v to the second form or construction.

Figures 1 and 1* show the platen'and associated parts in axial section,

Fig. 2 is a part axial section taken at right angles of the plan of section of Figures 1? and 1 Figures 3 and 4. are end views of the coupling members,

Figures 5 and 6 are detail views of the locking device for the movable part of the platen spindle,

Figure 7 is an elevation of the platen spindle,

Figure 8 is an axial section through the platen,

Figure 9 is a view of the platen spindle,

Figure 10 is an axial section of the platen and ratchet wheel on a plane at right angles to the plane of section of Figure 6.

Figure 11 is a section taken through the coupling arms showing the platen with the coupling in un-coupled position, the hand wheel, the un-couplingbutton and the locking device being shown in elevation.

The first form of construction is as follows:

The platen spindle comprises two parts l and 1*, connected to one another by means of a tubular connecting piece 2 fixed in the '8 fixed upon a tubular conn ctin iece 2 by means of a screw 7 serves as an abutment for one end of a spiral spring 9 which is pushed over the tubular connectingpiece .2', the other end of this spring 9 bearing against a sleeve 10 which is slidably mounted upon the tubular connecting piece 2.

The cross pin 11 passing through the sleeve 10 slides in a longitudinal slot 2 in the tubular connecting piece 2 and engages in'an axial slot 1 cut in the end of the part l of the plate spindle. The sleeve 10 can thus be shifted longitudinally upon thetubular connecting piece 2, rotation of the part l of the platen spindle in the connecting pieceQ being prevented, so that there is rotary driving connectionbetween the part 1 and the platen.

An {axially directed fork l2 fixed upon a sleeve 10 has two divei'fo'ing-slots 13 and 14: which engage studs 15 and 16 respectively, fixed to axles 17 and 18 respectively mounted longitudinally in the platen. Each of the axle'sl? and 18 projects through the end of theplaten and carries an eccentric 19, 20, which form frictional driving clutch between the platen and the rotatable ratchet wheel 21.

The part 1" of the platen spindle projects through a bearing 22 which has a cavity 23 within which projects a spring actu-.

ated locking lever 24:, adapted to engage a conical abutment l on the member 1". The cavity 23 has an internal screw mounted at its outer end, into which is screwed a cap 25 having an opening through which the part 1" of the spindle projects. The conical abutment 1 is designed to limit the outward movement of the part 1 of the spindle under the action of the spring 9. The usual hand wheel 26 is lined to theoute'r end of the part 1 of the spindle and a hand lever 52? is provided as a counter bearing for use when the hand wheel 26 is pressed inwardly to release the platen from the line spacing wheel.

The operation 01"? the device as follows: l l hen part l of the spindle is pushed in these operations.

the direction of the arrow at by pressing the inner wall of the ratchet wheel '2l,so

that the platen is. disconnected from the ratchet "wheel and can be rotated'indepenct,

ently of the latter.

At the end of this movement the conical stud 1 passes under the spring actuated locking lever 24 whichsnaps past the stud 1? and locks the part 1? ofthe platen. spindle againstreturn movement under the action of the spring 9. The platentherefore remains disconnected from the line spacing Wheel.

/Vhenit is desired to couple the platen with the line spacing'wheel again, the'locking lever 24 is rocked by. hand so that the part 1* of the spindle is released and is brought baclrto its initial position by the action of the spring 9, the studs '15 and 16 and the eccentrics 19 and 20 being, also returned totheirxinitial positions, so that the driving connection between the ratchet wheel .and the fork is re-established.

.To remove the platen froin the typewriter machineyit is merely necessary to unscrew the cap 25 and release the screw l, whereupon parts 1 and 1 of the platenspindl'e canbe withdrawn and the platen removed. The platen can be mounted in position again in an equally simple manner, by reversing the process. I

The second form otconstruction which is illustrated in Figures 8 to 11, differs from the first merely in the elements which controlthe coupling between the platen and the line spacing wheel.

Whilst according to the first form of-constrnction the part l ot'the platen spindle is used for releasing the coupling aswell as for rotating the platen by hand, according to the second form of construction a separate elementis provided for each of A tube 2 corresponding in diameter to the tubular sleeve 2 encloses the part 1 of the platen spindle and carries a hand'wheel 26 The tube 2 has at its outer end an angular slot forming part of the bayonet joint for axially moving the part l of the platen spindle. The tube 2 is coupled to the tubular sleeve 2 by means of a claw like engagement between the two tubes, and the tubes are secured in the coupled position by means of a locking screw 28? engaging with a boring 28. In this manner any'play on the part of the platen during rotation of the hand wheel is prevented.

is to be'shifted -to release the coupling. The

bayonet joint comprises astud 29 fixed in the part l of the platen spindle and engaging in theangular slot 30 of the tube 2 said stud'29 entering into a notch 30 in the slot when the part 1? of the spindle is rotated relatively to thetube 2 whilst thelatter is at the extreme inner end of its movement.

A n'obf fixed on the outer endof the part1" otthe platen spindle facilitates manipulation, the inner end of the saidpart 1 being. cut square and bearing against the cross pin 11 during the operation of releasing the coupling. I This. form of construction operates as 01 lows: Uponniovemcntot the part 1". of the platenspindlev in the direction of the arrow a (Figure 8), the cross pin .11 and the coupling: sleeve 10 are shittedagainst the action of the spring. 9, thereby releasing the coupling in the manner described with reference to the first form. of construction of the invention. lVhen it is required lock the coupling in an. uncoupledposition the part, l fof the spindle is held against, return movement under. action pf the spring 9 by bringing the stud 29.1'nto engagement with the notch 30 by a slight rotation. The con: pling between the platen and linejspacing Wheel is thus maintained in disconnected p0 sitionandthe platen can be adjusted by retating the hand wheel 265- Converselyg'the line. spacing wheelcan be. coupled to the platen 3 again by releasing thebayonet joint 29,230,. l

The platen?) can easily be removed as upon loosening ofthe. locking screws 4 -and 28 the; parts l and 1 of the platen spindle together with the tube 2 can be with-i drawn, whereupon the platen can be removed.

I claim 1. Free wheel for the platen of typewritlng machines comprising in combination withthe platen and with the ratchet wheel. a platen spindle composed of two parts of which one is-fixed to the platen the other being mounted in the same so that it-can be moved .in longitudinal direction, attibular sleeve. in the platen for connecting the said two parts of the spindle, and an feccentric inserted between the said ratchet wheelandfsaid platen and connected with said movable part of said spindle-so that it can be turned withiaregard to; the platen when said movable.part of the spindle is being moved. 1 I

2. Free wheel for the platen of type writing machines comprising in combina tion with the platen and with the ratchet llO wheel, a platen spindle composed of two parts of which one is fixed to the platen the other being mounted in the same so that it can be moved in longitudinal direction, a tubular sleeve in the platen for connecting the said two parts of the spindle, and two eccentrics inserted between the said ratchet wheel and said platen and connected with said movable part of said spindle so that they can be turned with regard to the platen when said movable part oi the spindie is being moved.

Free wheel for the platen of typewriting machines comprising in combination with the platen and with the ratchet wheel, a platen spindle composed of two parts of which one is fixed to the platen the other being mounted in the same so that it can be moved in longitudinal direction, a tubular sleeve in the platen for connecting the said two parts of the spindle, two eccentrics inserted between the said ratchet wheel and said platen, axial pivot bolts of said eccentrics, radial studs of said pivot bolts, and an axial fork connected with said movable part oi the spindle and having oblique slots with which said radial studs engage so that said eccentrics are turned when said movable part of the spindle is moved in longitudinal direction.

l. Free wheel for the platen of typewriting machines comprising in combination with the platen and with the ratchet wheel, a platen spindle composed of two parts, one of which is lined to the platen the other one being mounted in the platen so that it can be moved in longitudinal direction and having a cross boring, a tubular sleeve in the platen for connecting said two parts of the spindle having a longitudinal slot, a coupling sleeve upon said tubulaisleeve, a cross pin of said coupling sleeve traversing said slot of the tubular sleeve and said boring of the movable part of the spindle, an axially directed fork fined to said coupling sleeve having two oblique guide slots, two eccentrics engaging with said ratchet wheel, axially directed axles of said eccentrics, radial studs oi said axles engaging with said oblique slots of said fork so that when said movable part of the spindle is moved in longitudinal direction said eccentrics are brought out of en gagement with said ratchet wheel, and spring acting upon said coupling sleeve for maintaining the same in the coupling position.

5. Free wheel for the platen of typewriting machines comprising in combination with the platen and with the ratchet wheel, a platen spindle composed of two parts of which one fixed to the platen the other being .mounted in the same so that it can be moved in longitudinal direction, a tubular sleeve in the platen :tor connecting the said two parts of the spindle, the

coupling members of the free wheel connected with said movable part of the spindle, a conical collar upon the outer part of said movable part of the spindle, a bearing for said movable part having a cavity corresponding with said conical collar and a slot, a locking lever projecting through said slot of the bearing and engaging with said conical collar so that said conical collar can be brought in engagement with said cavity of the bearing in order to lock said movable part of the spindle in the .iree wheel position. of the platen.

6. Free wheel for the platen of typewriting machines comprising in combination with the platen and with the ratchetwhe'el, a platen spindle composed of two parts oi -Which one is fixed to the platen the other being mounted in the same so that itcan be moved in longitudinal direction, a tubular sleeve in the platen for connecting the said two parts of the spindle, and the coupling members of the free wheel connected with said movable part of the spindle, a hand wheel upon the outer end of said movable part the spindle, a tube enclosing saidmovable part of the spindle 

